Netgear FVS336Gv2 – ProSafe Dual WAN Gigabit Firewall with SSL & IPSec VPN 참조 매뉴얼

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Configure the IPv4 Internet and WAN Settings 
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ProSAFE Dual WAN Gigabit WAN SSL VPN Firewall FVS336Gv2 
Configure the Auto-Rollover Mode and Failure Detection 
Method for IPv4
 
Interfaces
Instead of using two WAN interfaces simultaneously in a load balancing configuration, you 
can use one WAN interface as the primary link and the other WAN interface as the backup 
link for increased reliability.
The following sections provide information about configuring auto-rollover mode and the 
failure detection method for IPv4 interfaces:
Auto-Rollover Mode and Failure Detection
To use a redundant ISP link for backup purposes, ensure that the backup WAN interface is 
configured. Then select the WAN interface that must function as the primary link for this 
mode and configure the WAN failure detection method to support auto-rollover.
When the VPN firewall is configured in auto-rollover mode, it uses the selected WAN failure 
detection method to detect the status of the primary link connection at regular intervals. For 
IPv4 interfaces, the VPN firewall detects link failure in one of the following ways: 
By sending DNS queries to a DNS server
By sending a ping request to an IP address
From the primary WAN interface, DNS queries or ping requests are sent to the specified IP 
address. If replies are not received, after a specified number of retries, the primary WAN 
interface is considered down and a rollover to the backup WAN interface occurs. When the 
primary WAN interface comes back up, another rollover occurs from the backup WAN 
interface back to the primary WAN interface. The WAN failure detection method that you 
select applies only to the primary WAN interface, that is, it monitors the primary link only.
Configure Auto-Rollover Mode for IPv4 WAN Interfaces
The following procedure describes how to configure auto-rollover mode for IPv4 WAN 
interfaces.
To configure auto-rollover mode for IPv4 WAN interfaces:
1. 
On your computer, launch an Internet browser.
2. 
In the address field of your browser, enter the IP address that was assigned to the VPN 
firewall during the installation process.
The VPN firewall factory default IP address is 192.168.1.1.
The NETGEAR Configuration Manager Login screen displays.
3. 
In the Username field, type your user name and in the Password / Passcode field, type 
your password.